Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in carrying amount of goodwill

The changes in the carrying amount of goodwill for the years ended December 31, 2018 and 2017, are as follows (in thousands):

	2018			2017
Goodwill balance at January 1	$	238,147		$	211,927
Effect of foreign exchange	(1,304		)	2,641
Additions as the result of acquisitions	98,590			23,579
Goodwill balance at December 31	$	335,433		$	238,147

Other intangible assets

Other intangible assets at December 31, 2018 and 2017, consisted of the following (in thousands):

	2018
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Patents	$	19,378	$	(5,012	)	$	14,366
Distribution agreements	8,012		(5,766		)	2,246
License agreements	26,930		(7,411		)	19,519
Trademarks	29,998		(6,586		)	23,412
Covenants not to compete	1,028		(1,000		)	28
Customer lists	39,936		(23,361		)	16,575
In-process technology	3,420		—			3,420
Total	$	128,702	$	(49,136	)	$	79,566

	2017
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Patents	$	16,528	$	(3,737	)	$	12,791
Distribution agreements	7,262		(4,686		)	2,576
License agreements	23,783		(5,568		)	18,215
Trademarks	16,224		(4,686		)	11,538
Covenants not to compete	1,028		(968		)	60
Customer lists	31,935		(18,482		)	13,453
In-process technology	920		—			920
Total	$	97,680	$	(38,127	)	$	59,553

Estimated amortization expense

Estimated amortization expense for the developed technology and other intangible assets for the next five years consists of the following as of December 31, 2018 (in thousands):

Year Ending December 31
2019	$	58,035
2020	55,341
2021	48,084
2022	46,648
2023	45,417